Sony HVL-MT24AM User Manual download pdf (Page 54)

Aperture range graph

e aperture range for macro lenses is displayed on page 26 (TTL), and page 34

(Manual ash). e aperture ranges described here are for lenses other than macro

lenses, or when the subject distance is large.

TTL ash metering

Flash-subject

distance

in. Aperture lines

Aperture

Max. Aperture lines

Min. Aperture lines

Max. Aperture lines

e following explains how to obtain the aperture range using the two twin ash

units with a 1.5 m ash-to-subject distance and at ISO 100.

1 Dra

w a vertical line upwards from the ash-to-subject distance until it reaches

the minimum aperture line ().

2 Draw a horizontal line lewards from  until it reaches the vertical ISO line

corresponding to the camera used ().

Dra

w a diagonal line from  upwards and lewards. e result indicates the

minimum aperture that will provide the proper exposure ().



e maximum aperture can be obtained in the same way by using the maximum

aperture line ().e results of both calculations will give the usable aperture

range for obtaining the proper exposure ().

In this case, the proper exposure can be obtained by setting the camera’s aperture

from maximum to f/16.



e do

tted lines are employed when only one twin ash unit is used.

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Sony HVL-MT24AM User Manual Page 54